1.Ans:

From the figure,

Carbon dioxide (\(\rm CO_{2}\)) is being collected in the gas jar.

2.Ans:

The balanced chemical reaction for preparation of this gas is:

\(\rm CaCO_{3} \) + \(\rm 2HCl \) → \(\rm CaCl_{2} \) + \(\rm H_{2}O \) + \(\rm CO_{2}\)

3.Ans:

Carbon dioxide is acidic in nature.

Hence, a wet blue litmus paper is used to identify carbon dioxide. It turns into red.

4.Ans:

Carbon dioxide is 1.5 times heavier than air.

So, it will not escape from the gas jar kept straight upright. Hence, this gas collected in the gas jar kept straight upright.